JP2633510B2 - Animal interferon - Google Patents

Abstract

The basis of this disclosure rests on the discovery, identification and isolation of a class of animal interferon polypeptides and to their production via recombinant DNA technology in all of its aspects including microbial and cell culture exploitation. A number of bovine interferons are illustrated as representative of the class.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention generally relates to recombinant DNA technology, means and methods utilizing such technology to find a wide variety of animal interferons, their production, and the various products of this production and their use.

More particularly, the present invention relates to a DNA sequence encoding an animal interferon which is isolated and identified, and which is operably (read correctly) linked to a promoter sequence for expression. And the expression vehicle thus constructed. In another aspect, the invention relates to host culture systems, such as various microorganisms and vertebrate cell cultures (cell cultures), which can be transformed by such expression vehicles and thus express the DNA sequence.

[0003] In yet another aspect, the present invention relates to means and methods for converting novel end products of this type of expression into a whole, eg, a pharmaceutical composition, useful for prophylactic or therapeutic treatment of animals. Further, the present invention relates to the DNA sequence, the expression vehicle, the host culture system, and various methods useful for producing the final product and its complete product, and further relates to specific examples and related examples thereof.

[0004] The present invention encodes a series of bovine α-interferons and their in vit in an expression vehicle.
ro (in vitro) Based in part on knowledge of DNA sequences, including 3'- and 5'-flanking sequences, which facilitate binding and amino acid sequences deduced therefrom. In addition, these findings allow the development of means and methods for producing sufficient quantities of animal interferon by recombinant DNA technology, thereby enabling the measurement of its biochemical properties and biological activities, and thus its Enable efficient production for industrial / biological development.

The background of the present invention will be described, and in special cases,
To supplement the details of its implementation, publications and other materials are cited herein for reference, which are conveniently numbered at the end of the Detailed Description of the Invention herein. I do.

A. Animal interferons Interferon components have been isolated from tissues of various phylogenetic species below humans (1, 2, 3). Activity tests performed with these interferons have shown varying degrees of antiviral effects in requisite host animals (3, 4, 5, 6). Furthermore, it has been shown that these interferons are not necessarily species-specific. For example, preparations of bovine interferon isolated from tissues have shown antiviral activity against monkey and human cells (7). Similarly, human interferon has been found to be active in a variety of cells of lower phylogenetic species (7).

[0007] This interspecies interaction is undoubtedly due to the high degree of homology conservation in both amino acid composition and sequence between interferons. However, to date,
This explanation is only a theoretical explanation. Because of the insufficient quantity and purity of animal interferons available so far, clear experiments comparing the characterization and biological properties of the purified components with the corresponding parts of several humans Could not be performed (8, 9, 10, 11, 12).

In any event, despite these low amounts and low purity, a causal link between interferon and antiviral activity in essential animal hosts has been established. For example, producing animal interferons in high yields and purity has been initiated and successfully performed in animal bioassay experiments to treat animals for viral infections and malignant and immunosuppressive or immunodeficient conditions. It is highly desirable to bring industrial utility in. Furthermore, the production of isolated animal interferons allows their characterization both physically and biologically, thus providing a basis for classification and thereby comparative studies on the corresponding human interferons (8-20). .

Studies conducted with the aid of animal interferons up to the present invention have required the use of crude preparations due to the extreme difficulty in obtaining them, but have suggested very important biological functions. I have. This type of animal interferon not only shows relevant therapeutically potent antiviral activity, but is also effective as an additional prophylactic along with vaccine and / or antibiotic treatment, making it a very promising clinical and commercial candidate It is clear that it can be mentioned as a substance.

The use of recombinant DNA technology has appeared to be the most effective way to provide the requisite amount of animal interferon necessary to achieve clinical and industrial development. Regardless of whether or not the materials produced in this way contain glycosylation that may be characteristic of naturally occurring materials, these are likely to have a wide range of viral properties in animals,
It will exhibit biological activity that would allow its use clinically in the treatment of neoplastic (tumor) and immunosuppressive conditions or diseases.

B. Recombinant DNA technology Recombinant DNA technology has reached an age of some advanced knowledge. By recombining various DNA sequences with considerable ease, molecular biologists can create novel complete DNA that can produce significant amounts of exogenous (foreign) protein products in transformed microorganisms. General means and methods include DN
In v fragments with different blunt ends or "sticky" end of A
Itro- ligation is performed to produce a powerful expression vehicle useful for transforming a particular organism, thus allowing it to be used for efficient synthesis of the desired exogenous product. However, for individual products, the production route is somewhat cumbersome, and the science in such fields has not always progressed to the point where certain expectations of success are made. In fact, even those who foretell success without being based on basic experiments carry the significant danger of being infeasible.

[0012] Plasmids, often non-chromosomal loops of double-stranded DNA, often found in bacteria and other microorganisms as multiple copies per cell, are a fundamental element of recombinant DNA technology. The information encoded in the plasmid DNA includes the information necessary to regenerate the plasmid in the daughter cell (i.e., the origin of replication) and usually one or more phenotypic selection properties, such as, for bacteria,
Included is resistance to antibiotics, which allow the identification of clones of host cells containing the plasmid of interest and preferentially growing them in selective media. The usefulness of plasmids is
This lies in the fact that it can be specifically cleaved by one or other restriction endonucleases or "restriction enzymes" that distinguish the different sites above. The heterologous gene or gene fragment can then be inserted into a plasmid by end joining at the cleavage site or at the rearranged end adjacent to the cleavage site. In this way, a so-called replicable expression vehicle is formed. Although the DNA tissue is performed outside the cell, the resulting "recombinant" replicable expression vehicle or plasmid can be introduced into the cell by a method known as transformation, and a large amount of the recombinant vehicle is transformed. Obtained by growing transformants. Furthermore, if the gene is inserted properly with respect to the part of the plasmid that governs the transcription and translation of the encoding DNA message, the resulting expression vehicle can be used to actually produce the polypeptide sequence encoded by the inserted gene, This process is called expression.

[0013] Expression is initiated in a region known as a promoter which is recognized and bound by RNA polymerase. During the transcription phase of expression, the DNA is unwound, exposing it as a template to initiate the synthesis of messenger RNA from the DNA sequence. The messenger RNA is then translated into a polypeptide having the amino acid sequence encoded by the mRNA. Each amino acid is encoded by a nucleotide triplet or "codon", which collectively constitutes a "structural gene".
, Ie, the portion that encodes the amino acid sequence of the expressed polypeptide product. Translation is initiated at the "start" signal (usually ATG, which becomes AUG in the resulting messenger RNA). The so-called stop codon defines the end of translation and thus the end of the subsequent generation of amino acid units. The resulting product lyses host cells in a microbial system as needed,
And it can be obtained by recovering this product from other proteins by an appropriate purification method.

In practice, the use of recombinant DNA technology can result in the expression of completely heterologous polypeptides (so-called direct expression), or the expression of a heterologous polypeptide fused to a portion of the amino acid sequence of a homologous polypeptide. You can also. In the latter case, the biologically active product of interest is often bioinactivated within the fused homologous / heterologous polypeptide until cleaved in the extracellular environment.
(21, 22).

C. Cell Culture Techniques Cell culture and tissue culture techniques for studying genetics and cell physiology are well established. Means and methods for obtaining and maintaining permanent cell lines by continuous transfer treatment from isolated normal cells are already known. For research use, such cell lines are maintained on solid supports in liquid media or are grown in suspension with nutrient supports by growth. Scale-up for large-scale manufacturing likely to impose only mechanical problems
(Generally 23, 24).

SUMMARY OF THE INVENTION The present invention is needed to successfully produce animal interferons using recombinant DNA technology, each of which is preferably in direct form and approved in the market. It is based on the finding that it can be produced in sufficient quantities to initiate and conduct a clinical trial. This product is suitable in all its forms for use in the prophylactic or therapeutic treatment of animals, especially for viral infections and malignant conditions and immunosuppressed or immunodeficient conditions. The forms include the various possible oligomer forms and can include related glycosylation as well as allelic variations of individual elements or species. These products are produced by genetically engineering microorganisms or cell culture systems. That is, there is now the ability to produce and isolate animal interferons in a more efficient manner than previously possible. One of the salient factors of the present invention, in the most preferred embodiment of the present invention, is that it is capable of isolating a microorganism or cell culture from a representative animal interferon produced by the host cell in mature form, ie, bovine interferon. It is in achieving genetic engineering to produce in quantity.

The present invention includes the animal interferon thus produced and the means and method for producing the same.
The present invention is further directed to a replicable DNA expression vehicle having a gene sequence encoding an animal interferon in an expressible form. Further, the present invention is directed to a microbial strain or cell culture transformed with the above-described expression vehicle and further to a fermentation medium comprising such a transformed strain or culture (culture) capable of producing animal interferon. It is.

In yet another aspect, the invention is directed to the interferon gene sequences, DNA expression vehicles, microbial strains and various methods useful for producing cell cultures, and specific embodiments thereof. Can be Furthermore, the present invention is directed to the preparation of a fermentation medium for said microorganism or cell culture. In addition, in certain host systems, vectors can be devised to produce the desired animal interferon that is secreted in mature form from the host cell. The interferon containing the signal sequence obtained from the native 5'-flanking region of the gene is transferred to the cell wall of the host organism, and the signal sequence plays a role in promoting this transfer. It is believed that the signal moiety is cleaved at. This embodiment allows the isolation and purification of the mature interferon of interest without resorting to related processes designed to remove intracellular host proteins or cellular debris contaminants.

Furthermore, the present invention is particularly directed to the production of bovine interferon, a representative type of animal interferon encompassed by the present invention, which is produced in mature form by direct expression.

As used herein, the expression "mature animal interferon" includes microbial or cell culture production of animal interferon without a signal peptide or presequence peptide, immediately upon translation of the animal interferon mRNA. Thus, according to the present invention, it has methionine as the first amino acid (provided by inserting an ATG start signal codon in front of the structural gene), or if methionine is cleaved intracellularly or extracellularly, A mature animal interferon having the normal first amino acid is provided. Furthermore, according to the present invention, mature animal interferon can be produced together with a conjugate protein other than a normal signal polypeptide, wherein the conjugate protein can be specifically cleaved in an intracellular or extracellular environment (21). . Finally, mature animal interferons can be produced by direct expression without having to cleave off extraneous extraneous polypeptides. This is particularly important when setting up an expression vehicle to express mature interferon with its signal peptide, such as when certain hosts do not or do not efficiently remove the signal peptide. The mature interferon so produced is recovered and purified to a level suitable for use in treating viral infections, malignant conditions and immunosuppressive or immunodeficient conditions.

Animal interferon is endogenous to the living body of an animal, and has a nomenclature similar to that of human interferon, in which animals α (leukocyte), β (fibroblast) and γ
(Immune) -including interferon. All three strains have been identified in animal models. further,
Based on the example of cattle, the animal α-series is composed of a group of proteins as in humans, and the animal α-series studied has homology to the corresponding human α-interferon (homol
ogy) is less than either between these animal interferons themselves or between human α-interferons themselves. In addition, the bovine β series is composed of a different group of proteins than in humans. In addition, the present invention also provides interspecies and intrafamily hybrid interferons, utilizing common restriction sites in the genes of various animal interferons and recombining (recombining) corresponding portions in a known manner ( 57).

In any case, the animal interferons encompassed by the present invention include those normally endogenous (endogenous) to birds, cattle, dogs, horses, cats, goats, sheep, fish and pigs. I do. In particular, the present invention provides interferons for artiodactyls such as, for example, cattle, sheep and goats. The interferons provided by the present invention have use as antiviral and antitumor agents in respective host animals. For example, bovine interferon is actually used in treating respiratory complications in cattle in combination with an antibiotic (known per se) as a therapeutic component or in combination with a vaccine as a prophylactic component. Would. Applications of the type exemplified above include other cattle as well as sheep, goats,
Can be extended to pigs, horses, dogs, cats, birds and fish. For horses, dogs, cats and birds, the antitumor effects of the corresponding interferons are expected to be of particular industrial importance.

The following principles described for bovine interferons as representative of this class can be used to obtain animal interferons according to the present invention: Bovine tissue, eg, bovine pancreatic tissue, was frozen powdered and processed to digest and precipitate RNA and proteinaceous material to obtain high molecular weight bovine DNA. 2. This high molecular weight DNA was partially digested and randomly cut at the gene site. 3. The obtained DNA fragment was subjected to size fractionation to obtain a fragment of 15 to 20 kilobase pairs. 4. The fragment obtained in step 3 was converted into λ Charon 3
Cloned using the 0 phage vector. 5. The vector thus prepared was packaged in vitro into infectious phage particles containing rDNA to obtain a phage library. It was grown on bacterial cells up to about 10 ⁶ -fold. The phage were plated on bacterial turf to virtually confluence and screened by hybridization with a radioactive human interferon probe.

6. The corresponding DNA was isolated from the appropriate clone, a restriction map was generated and analyzed by Southern hybridization. The restriction fragment containing the bovine interferon gene was subcloned into a plasmid vehicle and then sequenced. 7. The sequenced DNA is then treated in vitro to insert it into a suitable expression vehicle, which is used to transform a suitable host cell, which is then grown in culture to produce the desired host cell. Of bovine interferon product was expressed. 8. Bovine interferon thus produced has 166 amino acids in its mature form beginning with cysteine, has 23 amino acids in the presequence, and is extremely hydrophobic in nature. Its monomer molecular weight was calculated to be about 21,409. It shows properties similar to human leukocyte interferon (8, 9, 10, 11),
In addition, it was found to have about 60% homology to human leukocyte interferon.

A. Microorganisms / cell culture 1. Bacterial Strains / Promoter The experiments described herein were performed in particular for the microorganism E. coli K.
-12 strain 294 (end ^{(end) A, thi -,} hsr -, khsm +) (2
This was performed using 5). This strain has been deposited with the American Type Culture Collection and has ATCC Accession No. 31446. However, it is also possible to use other various microorganisms strains, known E.
coli strains such as E. coli B, E. coli X1776
(ATCC No. 31537) and E. coli W3110
(F ^-, λ ^-, primitive nutrition stock protrophic) (ATCC No.27
325), E. coli DP50 SuPF (ATCC No.
39061, deposited on March 5, 1982), E. coli.
JM83 (ATCC No. 39602, deposited on Mar. 5, 1982), or many other microbial strains, many of which have been deposited and approved and have been deposited by microbial depositaries such as American Type Culture. Available (possible) from the collection (ATCC) (see ATCC catalog list, see 26, 26a).
These other microorganisms are, for example, Bacillus s.
encompasses Ubtilis) such as Bacilli and other enteric bacteria, among them, for example, Salmonella Chifuimuriumu (can be cited Salmonella typhimurium), and Serachiya-Marusesansu (Serratia marcesans), heterogeneous in this case, these intracellular A plasmid capable of replicating and expressing a gene sequence is used.

As an example, β-lactamases and the lactose promoter system have been advantageously used to initiate and sustain microbial production of heterologous polypeptides. References for details on the configuration and structure of these promoter systems
(27) and (28). Recently, a system based on the tryptophan operon, the so-called trp promoter system, has been developed. Details regarding the construction and structure of this system have been published by Gedell et al. (12) and Clyde et al. (29). Many other microbial promoters have been discovered and used, and details regarding their nucleotide sequences enable those skilled in the art to operably link them into plasmid vectors, which have been previously published (30). reference).

[0027] 2. Yeast strain / yeast promoter The expression system of the present invention further comprises the plasmid YRp7 (31,3
2,33) can also be used, which is E. coli and the yeast Saccharomyces ( Saccharomyces).
cerevisiae ) can be selected and replicated. For selection in yeast, the plasmid is TRP
1 gene (31, 32, 33) which contains a mutation in this gene found in yeast chromosome IV (3
Complement 4) (allow growth in the absence of tryptophan). One useful strain is strain RH218 (35) deposited at the American Type Culture Collection without restriction (ATCC No. 440).
76). However, it will be appreciated that any Saccharomyces cerevisiae strain containing a mutation that makes the cell trp1 is an effective environment for expression of the plasmid, including the expression system. Examples of other strains that can be used are pep 4
-1 (36). This tryptophan auxotroph also has a point mutation in the TRP1 gene.

When placed on the 5'-side of the non-yeast gene,
5'-flanking DNA sequence (promoter) from yeast gene (for alcohol dehydrogenase 1)
Can promote (promote) the expression of exogenous genes in yeast when placed in the plasmid used to transform yeast. In addition to the promoter, proper expression of the non-yeast gene in yeast, a second yeast sequence located at the 3'-end of the non-yeast gene on the plasmid to allow proper transcription termination and polyadenylation in yeast. Need. This promoter can be suitably used in the present invention as well as others (see below). In a preferred embodiment, the 5'-flanking sequence of the yeast 3-phosphoglycerate kinase gene (37) is located upstream of the structural gene and then has a termination-polyadenylation signal, such as TRP 1 (31,32, 3
3) Gene or PGK (37) gene is present.

The yeast 5'-flanking sequence (along with 3'-yeast termination DNA, see below) can function to promote the expression of foreign genes in yeast, so that the 5 'of any highly expressed yeast gene. -Flanking sequences could be used to express important gene products. Under certain circumstances, yeast expressed up to 65% of its soluble protein as a glycolytic enzyme (38), and since this high level is likely to result from high levels of production of individual mRNAs (39), The 5'-flanking sequences of other glycolytic genes can be used for this type of expression purposes, such as enolase, glyceraldehyde-3-phosphate dehydrogenase, hexokinase, pyruvate decarboxylase, phosphofructokinase , Glucose-6-phosphate isomerase, 3-phosphoglycerate mutase, pyruvate kinase, triosephosphate isomerase, phosphoglucose isomerase and glucokinase. Either of the 3'-flanking sequences of these genes may have the appropriate termination and mRNA in this type of expression system.
It can be used for polyadenylation (see above). Certain other highly expressed genes have high levels of production due to mutations in the acid phosphatase (40) and in the 5'-flanking region, usually due to the presence of the TY1 transposable element. Expressed (mutant that increases expression) (41).

All of the above genes appear to be transcribed by yeast RNA polymerase II (41). Promoters (41,42) for RNA polymerases I and III that transcribe genes for ribosomal RNA, 5S RNA and tRNA are useful in this type of expression configuration.

Finally, many yeast promoters also have transcriptional control effects, which can be switched by changes in growth conditions. Some examples of this type of yeast promoter are genes that produce the following proteins:
Alcohol dehydrogenase II, isocytochrome-c, acid phosphatase, a degrading enzyme involved in nitrogen metabolism, glyceraldehyde-3-phosphate dehydrogenase and enzymes involved in maltose and galactose utilization (39). Such control regions are extremely useful in regulating the expression of protein products, especially if their production is toxic to yeast. Furthermore, one kind of 5 '
-The control region of the flanking sequence could also contain a 5'-flanking sequence containing a promoter from a highly expressed gene. This results in a hybrid promoter, which may be possible because the control region and the promoter appear to be physically distinct DNA sequences.

[0032] 3. Cell culture system / cell culture vector: Propagation of vertebrate cells in culture (tissue culture) has become a routine method in recent years (see 43). COS of monkey kidney fibroblasts
The -7 line can be used as a host for the production of animal interferons (44). However, the experiments detailed here are compatible with any cell line that allows the replication and expression of a compatible vector, such as WI38, BHK, 3T3,
It can also be performed in CHO, VERO and Hela cell lines. In addition, what is required for the expression vector is the origin of replication and a promoter located in front of the gene to be expressed and any required ribosome binding, RNA splice, polyadenylation and transcription termination sequences. . While these essential elements of SV40 have been used in the present invention, it is not to be understood that the invention is limited to only those sequences described herein as preferred embodiments. For example, the origin of replication of other viral vectors (eg, polyoma, adeno
(Adeno), VSV, BPV, etc.) as well as cellular origins of DNA replication that can function in a non-integral manner.

B. Vector system 1. Direct of mature bovine interferon in E. coli
The procedure used to directly express bovine interferon in E. coli as a mature interferon polypeptide (minus signal sequence) comprises a plasmid containing a promoter fragment and a translation initiation signal, and an animal containing the coding region for mature interferon. Includes combinations of genomic DNA with processed fragments.

[0034] 2. Expression in yeast Expression of a heterologous gene, such as DNA for animal interferon, in yeast requires the production of a plasmid vector containing four components. The first component is
Genes that allow the transformation of both E. coli and yeast, and are therefore selectable from either organism, eg,
It is the part that must contain the ampicillin resistance gene from E. coli and the gene TRP1 from yeast. This component also requires an origin of replication from both organisms to be maintained as plasmid DNA in both organisms,
For example, it requires the E. coli origin from pBR322 and the ars 1 origin from yeast chromosome III.

The second component of the plasmid is a 5'-flanking sequence from a highly expressed yeast gene that facilitates the transcription of a downstream located structural gene; for example, the 5'-flanking sequence used is From the yeast 3-phosphoglycerate kinase (PGK) gene. The third component of this system is a structural gene created to contain both an ATG translation start signal and a translation stop signal. The isolation and structure of this type of gene is described below. 4th
Is a yeast DNA sequence containing the 3'-flanking sequence of the yeast gene and contains appropriate signals for transcription termination and polyadenylation.

3. Expression in Mammalian Cell Culture The method of synthesizing immune interferon in mammalian cell culture relies on the development of vectors capable of both autonomous replication and expression of foreign genes under the control of heterologous transcription units. Replication of this vector in tissue culture
It is achieved by providing a helper function (T antigen) by introducing the vector into a cell line that provides a DNA replication origin (from the SV40 virus) and expresses the T antigen endogenously (46, 47). The SV40 virus late promoter precedes the interferon structural gene and ensures gene transcription.

A useful vector for obtaining expression is pBR
322 sequences, which provide a selectable marker (ampicillin resistance) for selection in E. coli as well as e-colliolysin for DNA replication. These sequences are obtained from plasmid pML-1 (46), Eco R
Includes a region spanning the I and Bam HI restriction sites. The SV40 origin is derived from a 342 base pair Pvu II- Hind III fragment containing this region (48,
49) (both ends are converted to Eco RI ends). These sequences not only contain the viral origin of DNA replication, but also encode promoters for both the early and late transcription units. The orientation of the SV40 origin region is such that the promoter for the late transcription unit is close to the gene encoding interferon.

The detailed description set forth below is illustrative of the present invention for producing various animal interferons via recombinant DNA technology, and particularly encompasses methods commonly used for the production of bovine leukocyte interferon. And shows. The method is described for a bacterial system.

A. For the purpose of creating an animal gene library (library) of bovine DNA , high molecular weight DNA was isolated from animal tissue by a modification of the Blin and Stafford method (50), randomly fragmented for gene sites and sized. Fractionation yielded a 15-20 kilobase fragment for cloning into the λ phage vector (51).

Frozen tissue, eg, bovine pancreas, is ground to a fine powder in liquid nitrogen, 0.25 M EDTA, 1% Sarkosyl, and 0.1 mg / ml proteinase K (25 ml / g tissue). At 50 ° C. for 3 hours. The resulting viscous solution was extracted three times with phenol and one time with chloroform to remove proteins, and 50 mM Tris-H was added.
It was dialyzed against Cl (pH 8), 10 mM EDTA and 10 mM NaCl and digested with heat-treated pancreatin ribonuclease (0.1 mg / ml) at 37 ° C. for 2 hours. After extraction with phenol and ether, the DNA was
Precipitate with twice the volume of ethanol, wash in 95% ethanol, lyophilize and add to a final concentration of 1-2 mg / ml in TE buffer (10 mM Tris-HCl (pH 7.5) and 1 mM EDTA). Redissolved overnight at 4 ° C. Final DN
The A preparation was greater than 100 kilobases in length as determined by 0.5% neutral agarose gel electrophoresis.

B. Elimination of partial endonuclease of bovine DNA
Of purified and size-fractionated bovine DNA in 1.25, 2.5, 5, and 10 units of Sau3A at 10 mM Tris-HCl (p
H7.5), 10 mM MgCl ₂ and 2 mM dithiothreitol (1 ml) were digested at 37 ° C. for 60 minutes. The incubation was stopped by adding EDTA to 25 mM, extracted with phenol and ether, made up to 0.3 M sodium acetate (pH 5.2), and precipitated with 3 volumes of ethanol. This DNA is
Redissolved in E buffer at 68 ° C, and Beckman SW27
The mixture was sedimented for 22 hours at 20 ° C. using a 10-40% linear sucrose gradient (51) at 27,000 rpm in a mold rotor. These fractions (0.5 ml) were used as molecular weight standards for Eco.
Analysis was performed on a 0.5% gel using RI-digested Sharon 4A (51a) DNA. 15-20 kilobases of D
The fractions containing the NA fragment were combined, precipitated with ethanol and redissolved in TE buffer.

C. Preparation of Bovine Genomic DNA Preservation A 15-20 kb unlimited digest of bovine DNA was prepared by
GAT- resulting from the removal of the internal BamHI fragment
Λ Sharon 30A vector with C cohesive end (52)
Cloned into it. Sharon 30A was transformed with E. coli strain DP50SupF (ATTC No. 39061, 1982).
(Deposited March 5, 2008) in NZYDT broth, concentrated by polyethylene glycol precipitation, and purified by CsCl gradient centrifugation (53). The purified phage was extracted twice with phenol and once with phenol and ether, and the DNA was concentrated by ethanol precipitation to prepare phage DNA.

To prepare the terminal fragment of Sharon 30A, 50 μg of phage DNA was added to 50 mM Tris-HC.
1 (pH 8), 10 mM MgCl ₂ and 0.15 M NaCl in 0.25 ml at 42 ° C. for 2 hours.
, Extracted with phenol and ether, and precipitated on a 10-40% sucrose gradient as described above. Fractions with the 32 kb annealed arm of the phage were collected and ethanol precipitated. The purified Sharon 30A arm (6 μg) was re-annealed at 42 ° C. for 2 hours, mixed with 0.3 μg of 15-20 kb bovine DNA and 400 units of Phage T4 polynucleotide ligase, and 50 mM Tris-HCl (pH7). .
5), 10 mM MgCl ₂ , 20 mM dithiothreitol and 50 μg / ml bovine serum albumin in 0.075 ml of a reaction solution at 12 ° C. overnight.
The bound DNA mixture was then encapsulated into mature lambda phage particles using an in vitro lambda encapsulation system (54).

The components of this system, namely the sonic extract (S
E), freeze-thaw lysate (FTL), protein A and buffers A and M1 were prepared as described in the literature
(54). 3 μl of the ligated DNA mixture was added to 15 μl of buffer A, 2 μl of buffer M1, 10 μl of SE and 1 μl
Of protein A at 27 ° C. for 45 minutes. The FTL was thawed on ice for 45 minutes, mixed with 0.1 volume of buffer M1, centrifuged at 35,000 rpm at 4 ° C. for 25 minutes, and 0.075 ml of supernatant was added to the reaction . After a further 2 hours incubation at 27 ° C., a small amount of the encapsulation reaction was transferred to strain DP50 SupF (above).
Titrated above. This procedure yielded a total of about 1.1 × 10 ⁶ individual bovine DP recombinants. The remaining encapsulation mixture was amplified by the plate-lysate method (52), wherein the recombinants were inoculated on DP50 SupF at a density of 10,000 plaque forming units per 15 cm NZYDT agar plate.

D. For bovine interferon gene
Screening of large library The method used to identify phage recombinants with the bovine interferon gene was prepared from cloned human leukocytes (8, 9), fibroblasts (12) and immune (55) interferon genes. Detecting nucleotide homology with a radioactive probe. Hybridization conditions are genomic animal DNA
Was established by Southern blot (56). 5 μg each of high molecular weight DNA (prepared as described above) from human placenta, bovine pancreas and pig submandibular gland was completely digested with EcoRI, electrophoresed on a 0.5% agarose gel, and nitrocellulose paper (56). P ³² - labeled DNA probes were prepared by standard methods (58) from the EcoRI fragment of 570 base pairs having a protein coding region of the mature human leukocyte interferon A / D hybrid BglII restriction site (57). Each nitrocellulose filter was washed with 5 × SSC (56) and 50 mM sodium phosphate (pH
6.5) Salmon sperm DNA sonicated at 0.1 mg / ml
And 5x Denhardt's solution (59), 0.1% sodium dodecyl sulfate and 10%, 20% or 30% formamide.
Prehybridize in 1% sodium pyrophosphate at 42 ° C. overnight, then 100 × per minute in the same solution containing 10% dextran sodium sulfate.
Hybridized with 10 ⁶ counts of labeled probe
(60). After overnight incubation at 42 ° C., filter paper was washed with 2 × SSC and 0.1% SDS at room temperature for 4 hours.
Washed once, washed once with 2 × SSC, and then exposed overnight to Kodak XR-5 X-ray film with a DuPont Cronex intensifying screen.
As can be seen in FIG. 1, a number of hybridized bands
When 0% formamide was present during hybridization, it was most easily detected in bovine and porcine DNA digests. This result provides evidence for multigenes of the leukocyte interferon gene in cattle and pigs similar to that exemplified above in humans (12, 61). Therefore, the same hybridization conditions were used to screen for the interferon gene in a bovine DNA library.

The 500,000 recombinant phages are divided into DP
Inoculate at a density of 10,000 pfu / 15 cm plate on 50 SupF and duplicate nitrocellulose filter paper replicas (dupli
(Catenitrocellulose filter replicas) were prepared for each plate by the method of Benton and Davis (62). These filters were hybridized with the human LeIF gene probe as described above. 96 duplicate hybridizing plaques giving a strong signal upon repeated screening were obtained.

The bovine library was further screened for fibroblasts and immune interferon genes.
These probes are a 502 base pair XbaI-BglII containing the entire mature human fibroblast interferon gene.
I fragment (12) and a 318 base pair AluI fragment (containing amino acids 12-116) and a 190 base pair Mbo
II fragments (containing amino acids 99-162), which were obtained from the mature coding region of the human immune interferon gene (55). Hybridization of 1.2 × 10 ⁶ recombinant phages resulted in a total of 2
Six bovine fibroblast interferon clones and ten bovine immune interferon clones were generated.

E. Characterization of recombinant phage Phage DNA was prepared as described above from 12 recombinants hybridized with the human leukocyte interferon probe. Each DNA was used for EcoRI, BamHI and Hin.
digested with any one of the dIII and by a combination thereof, electrophoresed on a 0.5% agarose gel,
The position of the hybridizing sequence was mapped by the Southern method (56). A comparison of single digested DNA from clones 10, 35, 78 and 83 is shown in FIG. For each phage, the observed restriction fragment sizes as well as the corresponding hybridization patterns were different and non-overlapping, suggesting that each of these four phages has a different bovine interferon gene. . In addition, clone 8 with each of the three enzymes
Digestion of 3 in each case resulted in two different hybridizing bands, indicating that the recombinant has two closely linked interferon genes.

F. Bovine leukocyte interferon gene
Restriction fragments from three of the recombinant phages hybridized with the cloned human leukocyte gene probe were ligated to the pBR322 derivative, pUC9 multiple restriction enzyme cloning site (multip
le restriction enzyme cloning site). This plasmid pUC9 is derived from pBR322
First, the 2067 base pair EcoRI-PvuII fragment containing the tetracycline resistance gene was removed, and then the 425 base pair HaeI from the phage M13 derivative mP9 (62a).
Position 2 in the HaeII site of the plasmid from which the I fragment was obtained.
352 (for pBR322 notation). The HaeII fragment from mP9 was used for the E. coli lac Z
Contains the N-terminal coding region of the gene, where the multiple-restriction enzyme cloning site of the sequence CCAAGC TTG
GCT GCA GGT CGA CGG ATC C
CCGGGG is inserted between the fourth and fifth amino acid residues of β-gactosylase. Insertion of a foreign DNA fragment into these cloning sites disrupts the continuity between the lac promoter and the lac Z gene, thus
JM83 transformed from ⁺ to lac ^- by plasmid
To change the expression system.

The above fragments were as follows; (a) a 1.9 kb BamHI fragment and a 3.7 kb EcoRI fragment from clone 83, which correspond to the non-overlapping segments of the same recombinant, ( b) 3.5 kb BamHI from clone 35
-EcoRI fragment and (c) 3.2k from clone 67
EcoRI fragment of b. In each case, 0.1 μg of the appropriately digested vector was ligated with a 10-fold molar excess of purified fragment and E. coli strain JM83 (ATCC No. 39) was used.
062, deposited on March 5, 1982), containing 0.04 mg / ml 5-bromo-4-chloro-3-indolyl-β-D-galactoside and 0.2 mg / ml ampicillin. And inoculated on M9 (63) plates. White colonies suspected of having a DNA insert at a restriction site interrupting the coding region of the lacZ gene on pUC9 were picked from LB broth + 5 mg of 0.02 mg / ml ampicillin.
ml, grown for several hours at 37 ° C., and the inserts were screened by minipreparation of plasmid DNA (64).

G. Bovine leukocyte IC for clone 83
The DNA sequence extending from the BamHI site of the 1.9 kb DNA fragment of the p83BamHI 1.9 kb (subclone of the 1.9 kb fragment of clone 83) was determined by the Maxam-Gilbert chemistry method (65) and was determined in FIGS. , And FIG. The longest open reading frame encodes a polypeptide of 189 amino acids with significant homology to human leukocyte interferon (FIGS. 7, 8, and 9). Due to homology with human proteins, bovine leukocyte interferon consists of a hydrophobic 23 amino acid signal peptide, which precedes the 166 amino acid mature protein by the same sequence, ie, ser-leu-gly-cys. The four cysteine residues at positions 1, 29, 99 and 139 are accurately retained between species. Paired homology comparisons between bovine interferon and human interferon are shown in Table 1. As expected, bovine protein has significantly less homology (about 60%) to each of the human proteins than the latter (greater than 80%).

The plasmid subclone p67EcoRI
3.2 kb, p35 EcoRI-BamHI 3.5 kb and p8
The DNA and deduced amino acid sequences for the three additional bovine leukocyte interferon genes generated for 3.7 EcoRI 3.7 kb are shown in FIGS. 4, 5 and 6, respectively. As summarized in Table 1, BoIFN-α2 and 3
The gene encodes a peptide that is only slightly different from BoIFN-α1, whereas the BoIFN-α4 protein is different from other bovine peptides, the latter being any two bovine and human leukocyte interferon. Is different.

In order to determine whether the α4 gene is derived from a wide variety of cellular proteins as well as other BoIFN-α, genomic bovine DNA was digested with several types of restriction endonucleases, and this was digested with α1 (612 bp). AvaII fragment of FIG. 11) and α4 (Ec of pBoIFN-α4trp15)
oRI-XmnI fragment) and a radioactive DNA fragment representing the protein-encoding region of the gene, under highly stringent conditions that do not allow cross-hybridization of these two genes.
(50% formamide). FIG.
As seen in Figure 1, each gene preferentially hybridizes to a different combination of bovine DNA fragments. These results clearly show the presence of two different bovine leukocyte IFN peptide types, of which α1 and α4
Proteins are considered representative.

[0054]

Table 1. Paired comparison of differences in coding sequences of bovine and human IFN-α. α1 α2 α3 α4 αA αB αC αD αF αH αI αJ αK BoIFN-α1 94 92 54 61 62 63 64 61 64 63 61 65 BoIFN-α2 96 91 53 61 61 64 63 62 63 63 64 64 BoIFN-α3 100 96 45 BoIFN -α4 52 48 52 54 54 58 55 56 58 56 54 54 HuIFN-αA 56 52 39 81 81 83 82 83 81 80 86 HuIFN-αB 43 39 48 70 81 77 81 83 80 79 81 HuIFN-αC 61 57 52 70 65 81 89 86 94 92 83 HuIFN-αD 52 48 48 74 61 65 83 81 80 78 84 HuIFN-αF 61 57 52 70 65 100 65 83 89 86 83 HuIFN-αH 56 52 52 74 74 74 83 74 84 84 84 HuIFN- αI 61 57 52 70 65 100 65 100 74 91 81 HuIFN-αJ 56 52 48 61 57 91 70 91 65 91 80 HuIFN-αK 52 48 48 83 70 74 91 74 91 74 65

In Table 1, numerical values indicate% homology, the lower left half indicates a 23 amino acid presequence, the upper right half indicates a 166 amino acid mature protein, and A,
B, C etc. are human leukocyte interferons A, B, C etc.

H. Mature BoIFN- in E. coli
Direct Expression of α1 Construction of the direct expression plasmid is summarized in FIG. The 1.9 kb plasmid subclone, p83BamHI, was digested to completion with AvaII, the 612 bp fragment containing the bovine leukocyte interferon gene was isolated by electrophoresis on a 6% polyacrylamide gel and electroeluted. About 1.5 μg of this fragment was digested with Fnu4H, extracted with phenol and ether, and precipitated with ethanol. The resulting Fnu4H cohesive ends were treated with 6 units of DNA polymerase I (Klenow fragment) with 20 mM Tris-HCl (pH 7.5), 10 mM MgCl ₂ and 4 mM.
Dithiothreitol and 0.1 mM dATP, dG respectively
It was extended to a blunt end for 30 minutes at 12 ° C. in 20 μl containing TP, dCTP and dTTP. After extraction with phenol and ether, the DNA was
Digested with I and electrophoresed on a 6% gel. The resulting 92 bp blunt-ended PstI fragment extends from the first nucleotide of the coding region of mature bovine leukocyte interferon and was electroeluted from the gel.

The remaining mature coding region was isolated as follows. 3 μg of the 1.9 kb BamHI insert of p83BamHI
With 4 units of PstI, 10 mM Tris-HCl (pH
7.5), partially digested in a 45 μl reaction containing 10 mM MgCl ₂ and 2 mM dithiothreitol for 10 minutes at 37 ° C. and extracted with phenol and ethanol. The desired 1440 base pair partial PstI-BamHI fragment extending from nucleotide 93 of the mature coding region was isolated from a 6% polyacrylamide gel.

The plasmid pdeltaRIsrc is identical to the plasmid pS
A derivative of RCex16 (66), in which the EcoRI site close to the trp promoter and away from the src gene has been removed by repair with DNA polymerase 1.
(67), self-complementary oligodeoxynucleotide AA
TTATGAATTCAT (phosphotriester method (6
8) to the remaining E immediately adjacent to the XbaI site.
Inserted into the coRI site. 20 μg of pdeltaRIsrc to E
Digested completely by coRI, extracted with phenol and ether, and ethanol precipitated. This plasmid was then digested with 100 units of nuclease S1.
Digestion with 5 mM sodium acetate (pH 4.6), 1 mM ZnCl ₂ and 0.3 M NaCl at 16 ° C. for 30 minutes generated a blunt end with the sequence ATG. After phenol and ether extraction and ethanol precipitation, the DNA was digested with BamHI, electrophoresed on a 6% polyacrylamide gel, and the large (4300 bp) vector fragment was recovered by electroelution.

0.2 μg of vector and 0.02 μg of 92
bp blunt-end PstI fragment and 0.25 μg of 1400 bp
Of the PstI-BamHI fragment and 400 units of T4DN
After assembling the expression plasmid by ligation at 12 ° C. overnight with A ligase, this was used to construct E. coli strain 294.
(ATCC No. 31446) was transformed to ampicillin resistance. Plasmid DNA was prepared from 96 colonies, which were digested with XbaI and PstI. Nineteen of these plasmids contained the desired 103 bp XbaI-PstI and 1050 bp PstI fragments. Analysis of the DNA sequence demonstrated that several of these plasmids had an ATG start codon located exactly at the start of the bovine interferon coding region. One of these plasmids, namely pBoIFN-α1trp55
Was selected for further consideration.

I. Mature bovine leukocyte-in in E. coli
A second type of direct expression ATG initiation codon of terferon (α-4) was prepared by using the synthetic DNA primer CATGT.
The enzymatic extension of GTGACTTGGTCT placed it in front of the mature coding region. Heptadecamer was phosphorylated with T4 polynucleotide kinase and γ- ³² P ATP as before (12). Combine 250 pmoles of primer with about 1 μg of a 319 bp HincII fragment containing amino acid residues S20-102 in 30 μl H ₂ O, 5
Boiled for 5 minutes and extended with 25 units of E. coli DNA polymerase I Klenow fragment at 37 ° C. for 3 hours. The product of this reaction was digested with HgiAI, and the resulting 181 bp blunt-end HgiAI fragment was isolated from a 6% polyacrylamide gel.

The entire gene for the mature peptide was ligated with the carboxy-terminal portion of the peptide and a HuIFN-γ expression plasmid or pIFN-γtrp previously digested with EcoRI.
508 bp HgiA-PstI containing 48-13 (55)
By enzymatically linking the fragment and the above fragment, tr
Integrate behind the p promoter, extend and flush
end) with Klenow DNA polymerase, Pst
Digested with I and finally isolated on a 6% polyacrylamide gel. Upon transformation of the resulting mixture into E. coli 294, several clones were identified, which were identical to the trp promoter ribosome binding site region of the parental expression vector and the fully encoded region of mature bovine IFN (pBoIFN-α4trp15). An EcoRI identification site was provided between the two.

J. Bovine fibroblast interferon gene
Six of the phage recombinants hybridized with the subcloned human IFN-β DNA probe were purified and their DNA was isolated for further analysis as described above. Restriction mapping in combination with Southern hybridization analysis shows that the six isolates consist of three different regions of the bovine genome, and therefore a multigene Bo
Means IFN-βs (family). These results are summarized by the restriction map shown in FIG. The hybridizing fragments were subcloned into plasmid vectors to obtain more detailed restriction maps and nucleotide sequences for each different type of recombinant. In particular, the 5 kb BglII fragment of phage λβ1 and the 5 kb Bam
The HI fragment was cloned individually into pBR322 at the BamHI site and the overlapping 4.5 kb Eco
The RI-XhoI and 1.4 kb PstI-HpaI fragments were each pUC9 (deleted from the EcoRI-SalI site).
And pLeIF87 (10) (deleted from HpaI-PstI).

K. Three Different Bovine Fibroblast IFN Genetics
DNA sequence view of the child 13 shows a restriction map for each of the three bovine IFN-beta gene was subcloned. These are easily distinguished by the presence of unique cleavage sites. The peptide coding region for each gene and the sequences immediately upstream and downstream were determined by the Maxam-Gilbert chemistry and are shown in FIGS. 14, 15 and 16. Nucleotide homology to the determined sequence for the human fibroblast interferon gene (12) predicts the correct reading frame and total amino acid sequence for each bovine gene product, which is a hydrophobic signal consisting of 21 amino acids. Includes the peptide followed by the mature protein of 185 residues. Bovine proteins are quite different from each other (Table 2, FIG. 17), but much larger (about 60%) compared to human peptides.
Is shown.

The multidiene properties of the bovine fibroblast interferon were determined. The Southern blot shown in FIG. 18 was used to determine the 415 bp Eco-DNA derived from pBoIFN-β1 trp.
This was shown by rehybridization with a radioactive probe prepared from the RI-PvuI fragment (below). FIG.
This experiment provided evidence for the presence of an additional cognate IFN-β gene, as shown in FIG. Fewer hybridizing bands actually show more clearly related genes, which encode more distinct β-IFN.

[0065]

Table 2 Paired comparison of homology in coding sequences of bovine IFN-β and human IFN-β β1 β2 β3 Huβ β1 138 (83) 138 (83) 84 (51) β2 20 (95) 146 (88) 92 (55) β3 20 (95) 19 (90) 87 (52) Huβ 16 (76) 17 (81) 16 (76)

The number of identical amino acids in each pair of coding sequences is shown. The 21 amino acid signal peptide is compared in the lower left part and the 166 amino acid mature IFN-β is compared in the upper right part of the table. The total number of identical amino acids in each pair is shown first, followed by the percent homology.

L. Three cattle IFNs in E. coli
Direct Expression of β Since the three bovine IFN-β genes share many common DNA sequences and restriction sites (see FIG. 13), a general scheme is possible for the expression of all three genes. . Two A
Since the DNA sequences encoding the first five amino acids containing the luI site were identical in each case, two complementary synthetic oligonucleotides were designed,
It incorporates the G translation initiation codon, restores the codons for the first four amino acids of mature bovine IFN-β, and generates an adherent EcoRI for insertion after the trp promoter sequence. The construction of the expression plasmid is illustrated in FIG. B
85 bp resulting from the IFN-β subclone plasmid
The binding of the synthetic oligomer to the AluI-XhoI fragment, followed by digestion with EcoRI and XhoI, was
1 flanked by coRI and XhoI cohesive ends
Generate a 04 bp fragment. Then, the entire encryption is 104bp
Fragment of about 700 bp encoding the remainder of each BoIFN-β protein and an internal EcoRI-
Plasmid pIFN-γtrp from which the PstI fragment has been removed
It was incorporated into the trp expression vector by ligation with 48-13 (55). The resulting plasmid, pBo
IFN-β1trp, pBoIFN-β2trp and pBoIF
All N-β3 trps were constructed such that proper transcription and translation of the IFN-β gene was performed under the control of the E. coli trp operon.

M. Bovine immune interferon (BoIFN-
γ) Characterization of the gene and 10 phage recombinants hybridized with the subcloned human IFN-γ probe were purified and DNA was prepared as described above. All ten DNA samples gave specific hybridized bands by Southern blot analysis. Clones λγ4 and λγ7 were selected for subsequent analysis because they have different hybridizing band patterns. The restriction maps of these two clones show overlapping DNA sequences. The overlapping region is the restriction site XbaI, Ec
Contains oRV and NcoI. DNA sequence analysis of these two clones was performed using the human immune interferon gene.
(70) shows an overall similar gene structure and
Contains the sequence encoding the fourth exon and λγ4
Contains sequences encoding the first three exons of the bovine IFN-γ gene based on DNA sequence homology with the human IFN-γ gene. The amino acid sequence suggesting BoIFN-γ is shown in FIG.
5) and that of rat IFN-γ.

Whole bovine IF for consecutive segments of DNA
Bovine IF generated from λγ4 to assemble N-γ gene
300 separating the first three exons of the N-γ gene
A 0 bp BamHI-NcoI fragment and a 2500 bp NcoI-HindII separating the last exon resulting from λγ7
The I fragment was isolated. These two DNA fragments are then combined with the Bam generated from pBR322 via three partial joins.
It was cloned into the HI-HindIII vector.

N. Bovine IFN-γ gene in mammalian systems
For expression e.g. purpose of obtaining those without intron boIFN-gamma as can express this gene in nucleus systems such as E. coli, the gene was treated to obtain high levels of expression in animal cell expression systems, Author An amount of the specific mRNA was obtained. 5500 bp B separating whole bovine IFN-γ gene
The amHI-HindIII fragment was inserted into the SV40 vector for expression in COS cells (44). In particular, B
amHI-HindIII bovine IFN-γ gene fragment
The clone was cloned into the 0 bp SV40 plasmid vector pDL [R1 [(SV4 was selectively replicated in the direction of late transcription).
By enzymatically deleting the EcoRI site upstream from the 0 origin, the HBV antigen expression plasmid pHBs348-
Arising from L. The expression plasmid pHBs348-L is H
19 resulting from an EcoRI and BglII digest of BV (71), which separates the gene encoding HBsAg.
The 86 bp fragment was inserted into plasmid pML (72) using EcoR.
(PML is a derivative of pBR322 with a deletion that removes sequences that inhibit repressed plasmid replication in monkey cells (72).) The resulting plasmid (pR
I-Bgl) was linearized with EcoRI and SV40
A 348 base pair fragment representing the origin region was digested with pRI-Bgl
At the EcoRI site. The origin fragment can be inserted in any direction. This fragment encodes both the early and late SV40 promoters in addition to the origin of replication, so that this orientation allows for the control of either promoter (pHBs348-L results in HBs expressed under the control of the late promoter). 600 bp generated from pBR322 between the BamHI and SalI sites.
Would be able to express the HBV gene through the three partial linkages in the presence of the HindIII-SalI conversion fragment. Transfection of the resulting plasmid into COS cells results in efficient expression of bovine IFN-γ under the control of the SV40 late promoter.

Poly A ⁺ mRNA was prepared from transfected COS cells and then prepared by standard methods (55).
Used to prepare cDNA. A cDNA clone hybridizing with the bovine IFN-γ gene probe was isolated. The cDNA clone with the longest PstI insert was selected for further analysis. Analysis of the DNA sequence of this cDNA clone shows that all expected intron sequences were correctly removed from the bovine IFN-γ genomic clone. The cDNA was processed for expression in E. coli by the primer repair method described above.

O. Preparation of bacterial extract 0.02 mg / ml ampicillin or 0.005 mg / ml
Overnight cultures grown in LB broth containing 0.1% tetracycline at a 1: 100 dilution in 50 ml M9 containing 0.2% glucose, 0.5% casamino acid and the appropriate drug. The medium was inoculated into medium (63) and grown at 37 ° C. with shaking until A550 = 1.0. 10 ml samples were harvested by centrifugation and immediately frozen in a dry ice-ethanol bath.
The frozen pellet was resuspended in 1 ml of 7M guanidine, incubated on ice for 5 minutes, and diluted in PBS for analysis. Alternatively, 0.2 ml of frozen pellet
20% sucrose and 100 mM Tris-HCl (pH 8.0)
And lysate by addition of 20 mM EDTA and 5 mg / ml lysozyme. After 20 minutes on ice, 0.8 ml of 0.3% Triton X-100 and 0.15 M Tris-H.
Cl (pH 8.0), 0.2 M EDTA and 0.1 mM P
MSF was added. Lysates were clarified by centrifugation at 19,000 rpm for 15 minutes and the supernatant was analyzed after dilution in PBS.

FIG. Interferon Assay Bovine interferon activity was analyzed by cytopathological effect (CPE) inhibition assay performed in a 96-well microplate as follows: 1. In each well of the 96-well microplate
(8 rows × 12 columns) Add 100 μl of cell suspension in medium containing 10% fetal calf serum. Adjust cell concentration to give fusion monolayer the next day. 2. Fix plate gently on fixation platform for 10 minutes to allow even distribution of cells. Next day: Add 80 μl of additional medium to each well in the first column. 4. To the first column of wells, add 20 μl of the sample to be analyzed for interferon activity. 5. 100 μl contents of wells with 100 μl pipette
The sample and media in the wells are mixed by withdrawing and injecting several times.

6. Well contents 1 in first column
Transfer 00 μl horizontally to the second column of wells. 7. Mix as in step 3. 8. Continue moving 100 μl of the well contents from column to column until a total of 11 transitions have been made. 9. Well contents 100μ in twelfth column
Remove and discard l. This process results in a serial two-fold dilution. 10. Each assay plate contains the appropriate NIH standard.

11. Plates are incubated for 24 hours at 37 ° C. in a CO ₂ incubation. 12. Each assay plate contains 100 μl of cell suspension and 10
Wells containing 0 μl medium to serve as cell growth comparisons, 100 μl cell suspension, 100 μl medium and 5 μl
0 μl of the virus suspension containing the virus to serve as a virus-induced cytopathogenicity comparison. 13. Attack all wells except cell comparisons containing 50 μl virus suspension. The multiple of the infection used
The amount of virus that produces 100% cytopathic effect on a particular cell line within 24 hours. 14． Re-incubate plate for 24 hours at 37 ° C. with CO ₂ incubation. 15. Remove the liquid from the plate and stain the cells with 0.5% crystal violet. Allow cells to stain for 2-5 minutes.

16. The plate well is washed with tap water and dried. 17． The interferon titer for a sample is the reciprocal of the dilution at which 50% of the viable cells remain. 18. Normalize the activity of all samples by the comparative unit conversion factor calculated from the following formula:

[0077]

## EQU1 ## Observed titer in actual titer / analysis of NIH standard = comparison unit conversion factor (see 69). E. coli strain 294 (ATCC No. 31446) transformed with pBoIFN-α1 trp55
Extracts show significant activity against the bovine kidney cell line (MDBK) challenged with the VS virus (Indiana strain), but not from monkey kidney (VERO), human cervical carcinoma (HeL).
a), showed no significant activity against rabbit kidney (RK-13) or rat (L929) cell lines, which were similarly challenged. Strain 294 transformed with pBR322
Did not show activity against MDBK cells. Table 3 shows the antiviral activity BoIF in vitro against various challenged animal and human cell lines.
N-α1 is summarized. BoIFN-α1 is easily distinguished from human leukocyte IFN by apparently lacking antiviral activity on human cells with respect to activity on bovine cells using the VS virus as an attack.
Table 4 shows the expression plasmids pBoIFN-α4trp15, pB
oIFN-β1trp, pBoIFN-β2trp and pBoI
E. coli W31 transformed with FN-β3 trp
10 shows the level of interferon activity obtained with the extract prepared from Example 10. Of particular note, while bovine fibroblast interferon is approximately 30-fold more active on the bovine kidney cell line than the human amniotic cell line, an inverse relationship was found for human fibroblast IFN (12). .

[0078]

Table 3 Cell line IFN preparation titer (units / ml) VSV EMCV MDBK LeIFA standard 640 NA Bovine leukocyte IFN 300,000 NA Comparative extract <40 NA HeLa LeIFA standard 650 1500 1500 Bovine leukocyte IFN <40 <23 Comparative extract <40 <23 L-929 Rat IFN Standard 640 1000 Bovine Leukocyte IFN <20 <31 Comparative Extract <20 <31 RK-13 Rabbit IFN Standard 1000 NA Bovine Leukocyte IFN <60 NA Comparative Extract <60 NA VERO LeIFA Standard 1500 Bovine leukocyte IFN <12 Comparative extract <12 MDBK = Bovine kidney cells VERO = African green monkey kidney cells HeLa = Human cervical cancer cells RK-13 = Rabbit kidney cells NA = Virus is not available because it cannot replicate sufficiently in each cell.

[0079]

Table 4 E. E. coli 294 (Units / L culture) transformed IFN-beta activity IFN-beta activity by interferon activity following in extracts coli (Units / L culture) MDBK-VSV WISH- VSV pIFN-α1 1.0 × 10 ⁸ N.V. D. pIFN-β1 2.2 × 10 ⁸ 6.5 × 10 ⁶ pIFN-β2 1.1 × 10 ⁸ 3.5 × 10 ⁶ pIFN-β3 6.0 × 10 ⁸ 2.0 × 10 ⁷ cell extract prepared They were then analyzed for interferon activity using bovine kidney MDBK and human amniotic WISH cell lines and VSV as challenge in accordance with published methods (Weck et al., 1981).

Pharmaceutical Compositions The compounds of the present invention can be formulated according to known methods to prepare pharmaceutically useful compositions, wherein the animal interferon product can be combined with an acceptable carrier vehicle. Suitable vehicles and their formulations have been described. Such compositions contain an effective amount of interferon protein together with a suitable amount of vehicle to prepare an acceptable composition suitable for effective administration to a host by known routes, eg, parenterally.

It will be appreciated that the animal interferons encompassed by the present invention exist with natural allelic variations. These may be indicated by amino acid differences in the entire sequence, or deletions, substitutions, insertions, inversions, or additions of amino acids in the sequence. All these alleles are included within the scope of the present invention. Although specific preferred embodiments have been described above, it will be understood that the invention is not so limited.

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[Brief description of the drawings]

FIG. 1: ³² P-labeled 570 base pair E containing the coding region of human leukocyte interferon A / D hybrid digested with Eco RI and at different formamide concentrations
hybridized with co RI fragment (a) human, a photograph as a drawing which shows the (b) bovine and (c) Southern hybridization of electrophoresis of genomic DNA of pig. 20%
Hybridization in formamide shows the clearest pattern of multidiene bovine and porcine leukocyte interferon genes.

FIG. 2 is a drawing alternative to a drawing showing Southern hybridization electrophoresis of four different recombinant bovine genomic DNA phage recombinants digested with EcoRI, BamHI or HindIII and hybridized with a ³² P-labeled human leukocyte gene probe. It is. Clone 83,
Each restriction enzyme gives two hybridized fragments.

FIG. 3. Plasmid subclone p83BamHI1.
A portion of the nucleotide sequence from 9 kb is shown, as well as the deduced amino acid sequence for bovine leukocyte interferon encoded therein. The signal peptide is represented by amino acid residues S1 to S23.

FIG. 4. Plasmid subclone p67EcoRI3.
Figure 3 shows the nucleotide sequence and deduced amino acid sequence for a second bovine leukocyte interferon (α2) from 2 kb.

FIG. 5: Plasmid subclone p35 EcoRI-Ba
Third bovine leukocyte interferon from mHI 3.5 kb
The fully mature nucleotide sequence and deduced amino acid sequence for (α3) are shown.

FIG. 6: Plasmid subclone p83EcoRI-Ba
The nucleotide and deduced amino acid sequence for the fourth bovine leukocyte interferon from mHI 2.9 kb is shown. The signal peptide is composed of amino acid residues S1 and S2
Indicated by 3. The mature protein consists of 172 amino acid residues. The final length of six amino acid residues is due to the nucleotide base change at position 511, allowing six additional translation codons before the next in-phase stop signal.

FIG. 7 shows a comparison of the amino acid sequences of BoIFN-α1, α2, α3 and α4 with the sequences for 11 known human leukocyte interferons. In addition, the amino acids retained in all human leukocyte interferons and all bovine leukocyte interferons, and the positions at which homology with the majority of human leukocyte interferons occurs for bovine α1 and α4 are indicated.

FIG. 8 shows a comparison of the amino acid sequences of BoIFN-α1, α2, α3 and α4 with the sequences for 11 known human leukocyte interferons. In addition, the amino acids retained in all human leukocyte interferons and all bovine leukocyte interferons, and the positions at which homology with the majority of human leukocyte interferons occurs for bovine α1 and α4 are indicated.

FIG. 9 shows a comparison of the amino acid sequence of BoIFN-α1, α2, α3 and α4 with the sequence for 11 known human leukocyte interferons. In addition, the amino acids retained in all human leukocyte interferons and all bovine leukocyte interferons, and the positions at which homology with the majority of human leukocyte interferons occurs for bovine α1 and α4 are indicated.

FIG. 10: Bovine leukocyte interferon expression plasmid
1 is a schematic diagram illustrating the generation of pBoIFN-α1trp55. Starting materials were BamHI from the trp expression vector pdeltaRIsrc and the plasmid subclone p83BamHI 1.9 kb.
It is a fragment.

FIG. 11: EcoRI, HindIII, BamHI, BglII
And PvuII digested bovine DNA and B
It is a photograph replacing a drawing which shows the electrophoresis of Southern hybridization with a radioactive probe prepared from oIFN-α1 or BoIFN-α4 gene fragment.
Each IFN gene hybridizes preferentially to a different subfamily (Subfamily) of the BoIFN-α gene.

FIG. 12 shows restriction maps of genomic bovine DNA inserts from three phage recombinants that hybridize human fibroblast human interferon gene probes.
The position and orientation of each BoIFN-β is indicated by a solid square. The restriction site indicated by an asterisk indicates partial restriction mapping information.

FIG. 13 shows more detailed restriction maps for the three genes shown in FIG. Hatching indicates the signal sequence, shading the mature sequence.

FIG. 14 shows the nucleotide sequence and deduced amino acid sequence for BoIFN-β1, 2, and 3 genes.

FIG. 15 shows the nucleotide sequence and deduced amino acid sequence for BoIFN-β1, 2 and 3 genes.

FIG. 16 shows the nucleotide sequence and deduced amino acid sequence for BoIFN-β1, 2, and 3 genes.

FIG. 17 shows a comparison between the amino acid sequences for three BoIFN-β and HuIFN-β.

FIG. 18: Human genomic DNA and HuIFN-β gene
When a similar experiment was carried out using (9), the Southern blot in FIG. It is a photograph replacing a drawing showing electrophoresis.

FIG. 19 is a schematic of the method used to express all three BoIFN-βs under the control of the E. coli trp operon.

FIG. 20 shows a comparison of the deduced amino acid sequences of BoIFN-γ, HuIFN-γ and mouse IFN-γ.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location // (C12P 21/02 C12R 1:19) (C12P 21/02 C12R 1:91)

Claims (9)

(57) [Claims] (1) The following formula: 2-165 amino acids represented by the following formula: 2-165 amino acids represented by the following formula: and the following formula: The amino acid sequence of any one of these sequences, or a natural bovine allelic variant of any of these sequences, without other non-human animal interferons, and the natural environment A non-human animal interferon substantially free of accompanying impurities. 2. The method of claim 1 without natural glycosylation.
Interferon according to the above. 3. The interferon of claim 1 having a methionine amino acid linked to the N-terminus of a normal first amino acid. 4. The interferon of claim 1, which has a cleavable associated protein or signal protein attached to the N-terminus of the normal first amino acid. 5. The following formula: A 2-165 amino acid represented by the following formula: 2-165 amino acids represented by the following formula: and the following formula: The interferon according to claim 1, which is a mature bovine fibroblast interferon containing any one of the amino acid sequences of 2-165 amino acids represented by 6. The following formula: A 2-165 amino acid represented by the following formula: 2-165 amino acids represented by; and the following formula: The amino acid sequence of any one of the above sequences or a natural bovine allelic variant of any of these sequences, without any other non-human animal interferon, and A method for producing a non-human animal interferon substantially free of concomitant impurities, the method comprising the steps of: comprising a microorganism culture transformed with a replicable expression vector operably carrying DNA encoding the interferon. Alternatively, a method comprising preparing a cell culture, growing the culture to produce the interferon, and recovering it. 7. The method of claim 6, wherein said non-human animal interferon does not involve natural glycosylation. 8. The method according to claim 6, wherein the non-human animal interferon is in a mature form. 9. The method according to claim 6, wherein the non-human animal interferon has a cleavable association protein or signal protein bound to the N-terminus of its normal first amino acid.